{
  "scope": "Bounded dry-sax artifact-risk diagnostic only; no listening or acceptance claims, no synthesis edits.",
  "method": {
    "level_matching": "Each file matched to -20 dBFS using median steady 10 ms block RMS within each eligible interval, then median across intervals; no global RMS.",
    "giant_steady": "Note interiors after 35 percent of short notes or 60 ms; omit final 18 percent or 25 ms and 8 ms before subsequent key movement.",
    "reference_steady": "C4 uses 0.65-2.65 s; tongue-eight uses the same span excluding 25 ms either side of modeled tongue-closure centers.",
    "events": "Six 10 ms blocks span -30 to +30 ms; releases use engine note-end extensions/clamps, tongue preclosure starts 6 ms earlier; key timing reconstructed from matching source and phrasing.",
    "highpass": "Causal fourth-order Butterworth at 3 kHz, applied continuously before slicing; report RMS, energy fraction and 3-12 kHz Hann-window spectral flatness.",
    "cautions": "Highpass energy and spectral flatness are noise-like proxies, not proof of noise or audibility. Harmonics, pitch/register and articulations differ; overlapping event windows are not independent. Matched values are analytical and not exported audio.",
    "reference_release": "2.78 s is breath-release start (3.2 s total minus 0.30 s tail minus 0.12 s release); breath reaches zero at 2.90 s. Giant releases mark target-pressure cessation and are not equivalent envelopes."
  },
  "provenance": {
    "score_sha256": "3af21760a62338b86ed4a297f7832c747857c11fb6aac057914304bf521e864e",
    "report_sha256": "79f8f03fc8859a85022d36e51038451b38ec74c9ac6339ac15e85b0131222ddf",
    "phrasing_matches_render_report": true,
    "performance_source_matches_render_report": true,
    "model_source_matches_render_report": true,
    "score_notes": 232,
    "report_notes": 232,
    "reconstructed_slurred_onsets": 91,
    "report_slurred_onsets": 91
  },
  "measurements": {
    "giant_alto_01": {
      "path": "experimental/giant-alto-01/sax-dry.wav",
      "sha256": "6fd78f4f2118c51600221aa174c3cbdde28ac1cee61a9de28e1f17ec917e7aa8",
      "sample_rate": 44100,
      "duration_s": 80.1,
      "raw_peak_dbfs": 0.0,
      "raw_peak_time_s": 36.050045351473926,
      "full_scale_sample_count": 2,
      "first_full_scale_sample_times_s": [
        36.050045351473926,
        55.090045351473925
      ],
      "raw_steady_rms": 0.04046086787396115,
      "raw_steady_rms_dbfs": -27.85929611947534,
      "steady_segment_median_rms_p10_p90": [
        0.028122978980810672,
        0.06324572714884173
      ],
      "steady_intervals": 232,
      "steady_10ms_blocks": 5171,
      "level_match_gain_db": 7.8592961194753395,
      "matched_steady_rms_dbfs": -20.0,
      "matched_peak_dbfs": 7.8592961194753395,
      "peak_over_steady_db": 27.85929611947534,
      "matched_steady_highpass_rms_dbfs": -53.02479479035016,
      "event_summaries": {
        "key_preparation": {
          "count": 224,
          "peak_over_steady_median_db": 10.71908898978541,
          "peak_over_steady_p95_db": 22.786437066007874,
          "peak_over_steady_max_db": 27.85929611947534,
          "highpass_rms_max_dbfs": -6.010218976909204
        },
        "onset": {
          "count": 232,
          "peak_over_steady_median_db": 10.379844927508653,
          "peak_over_steady_p95_db": 22.777249245050026,
          "peak_over_steady_max_db": 27.85929611947534,
          "highpass_rms_max_dbfs": -6.010218976909204
        },
        "release": {
          "count": 141,
          "peak_over_steady_median_db": 10.156621818512164,
          "peak_over_steady_p95_db": 21.91669452550038,
          "peak_over_steady_max_db": 27.85929611947534,
          "highpass_rms_max_dbfs": -6.326588117087725
        },
        "tongue_preclosure": {
          "count": 141,
          "peak_over_steady_median_db": 10.083158588726715,
          "peak_over_steady_p95_db": 21.91669452550038,
          "peak_over_steady_max_db": 27.85929611947534,
          "highpass_rms_max_dbfs": -6.049712392879741
        }
      },
      "worst_events": {
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            "concert_midi": 50,
            "bar": 29,
            "slurred_onset": true,
            "kind": "key_preparation",
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            "peak_time_s": 36.05004535147392,
            "maximum_peak_dbfs": 7.8592961194753395,
            "maximum_peak_over_steady_db": 27.85929611947534,
            "maximum_highpass_rms_dbfs": -6.262111798254929,
            "windows_10ms": [
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                "offset_ms": -30,
                "peak_dbfs": -10.084923421075464,
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                "highpass_rms_dbfs": -53.79509420882127,
                "highpass_energy_fraction": 0.0002773437036217117,
                "spectral_flatness_3_to_12khz": 0.019832630774065434
              },
              {
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                "highpass_energy_fraction": 0.00024752522868917335,
                "spectral_flatness_3_to_12khz": 0.013897297266188869
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              {
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                "peak_over_steady_db": 9.893221341031456,
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                "highpass_rms_dbfs": -55.853643616897486,
                "highpass_energy_fraction": 0.0001958304242843608,
                "spectral_flatness_3_to_12khz": 0.012512490260445548
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                "spectral_flatness_3_to_12khz": 0.007711790647904246
              },
              {
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                "highpass_energy_fraction": 0.05255479235361138,
                "spectral_flatness_3_to_12khz": 0.012867814499155064
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          {
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            "windows_10ms": [
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                "highpass_energy_fraction": 0.00033067027765777874,
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  },
  "source_findings": [
    {
      "category": "observed",
      "statement": "Changed key load histories are zeroed; capacitor, bore-edge and reed states are not reset in this branch.",
      "pattern_present": true,
      "source": "experimental/giant-alto-01/performance.py",
      "lines": [
        112
      ]
    },
    {
      "category": "observed",
      "statement": "Acoustic solver identity switches immediately at key preparation; no acoustic aperture interpolation here.",
      "pattern_present": true,
      "source": "experimental/giant-alto-01/performance.py",
      "lines": [
        114
      ]
    },
    {
      "category": "observed",
      "statement": "Only radiation weights receive the 3 ms key smoothing, not the acoustic load switch.",
      "pattern_present": true,
      "source": "experimental/giant-alto-01/performance.py",
      "lines": [
        217
      ]
    },
    {
      "category": "observed",
      "statement": "Tongue preclosure reduces target reed gap to 15 percent over the final 6 ms; precharge also uses 15 percent.",
      "pattern_present": true,
      "source": "experimental/giant-alto-01/performance.py",
      "lines": [
        129
      ]
    },
    {
      "category": "observed",
      "statement": "Gap modulation changes both flow opening and the reed contact boundary; no independent tongue force appears.",
      "pattern_present": true,
      "source": "experimental/giant-alto-01/performance.py",
      "lines": [
        169
      ]
    },
    {
      "category": "observed",
      "statement": "Model-03 tongue reference also modulates the reed-contact gap; it is not an independently validated tongue model.",
      "pattern_present": true,
      "source": "experimental/alto-sax-model-03/model.py",
      "lines": [
        288
      ]
    },
    {
      "category": "inference",
      "statement": "Abrupt acoustic load changes and terminal-history deletion can generate transients or remove stored energy; radiation-only smoothing cannot guarantee their suppression."
    },
    {
      "category": "inference",
      "statement": "Using lip_gap as a tongue actuator virtually moves the contact boundary rather than applying tongue force against a stationary mouthpiece; causal attribution needs isolated engine tests."
    },
    {
      "category": "recommendation_for_primary_only",
      "statement": "Investigate smooth acoustic aperture while preserving chamber states, and independent tongue contact force with a fixed mouthpiece boundary. No implementation or full-song tuning performed here."
    }
  ],
  "limitations": [
    "No subjective listening, no perceptual masking or loudness model.",
    "No counterfactual engine renders, therefore no measured attribution to individual source mechanisms.",
    "Steady-level matching is robust but not pitch-, velocity-, or articulation-matched."
  ]
}